answers to quiz 7.02 and 7.03

# answers to quiz 7.02 and 7.03 - User deniz gul In Course...

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: deniz gul In Course : Adv Pl Statistics V9 ( 2992) Instructor : Marlena Morrison If you would like to take this exam again, you can reset the exam and take it again Your score on this exam is 1.75 out of 4 . Answer Key for 7.02 Question 1 (Worth 1 points) The one-sample t statistic for a test of based on n = 12 observations has the value t = -2.45. (a) What are the degrees of freedom for this statistic? (b) What is the exact p-value? ESSAY SUBMISSION a) n-1 = 11 b).984 ESSAY FEEDBACK Good job on part a. For part b you will need to use your calculator: Tcdf(lower bound,upper bound,df) Since the Ha is <, the bounds will be -99,t Points earned on this question : 0.5 Question 2 (Worth 1 points) The amount of lead in a certain type of soil, when released by a standard extraction method, averages 86 parts per million (ppm). A new extraction method is tried on 40 specimens of the soil, yielding a mean of 83 ppm lead and a standard deviation of 10 ppm. (a) Is there significant evidence at the 5% level that the new method frees less lead from the soil? What about the 1% level? (b) A critic argues that because of variations in the soil, the effectiveness of the new method is confounded with characteristics of the particular soil specimens used. Briefly describe a better data production design that avoids this criticism. ESSAY SUBMISSION

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answers to quiz 7.02 and 7.03 - User deniz gul In Course...

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